Leaflet

• leading open-source JavaScript library
• has been around for ~ 10 years
• usually when you see maps online, they are made with Leaflet

Deck.gl

• started ~ 4 years ago
• especially great for large data and 3D views
• R package to access deck.gl: mapdeck

plotting all + 80.000 cars in Friedrichshain-Kreuzberg

geocomputation made easy with the ‘sf’ package

• crop polygon to outline of another polygon

streets_in_xhain <- st::st_intersection(streets_berlin, berlin) 

• sample points in a polygon

cars <- st::st_sample(streets_xhain,size=amount_cars_xhain)

Plot raster data with leaflet and leafem

• add raster data: leaflet::addRasterImage()
• add Mouseover for raster data: leafem::addImageQuery()

leaflet() %>% 
    addProviderTiles(providers$CartoDB.DarkMatter) %>%
    addRasterImage(hours_of_sunshine, colors =  pal, group = "hours of sunshine") %>% 
    addImageQuery(hours_of_sunshine, layerId = "hours of sunshine")

Which boulder gym is closest to you?

Create a geospatial voronoi map

• dismo::voronoi()

How large is the area of in 2019 destroyed rain forest?

Map made with mapview. Leaflet | © OpenStreetMap contributors © CARTO

leafpm for editable polygons

• leafpm::toolbarOptions() to draw, cut, edit and move vectors

use stplanr for routing and aggregating lines

• stplanr::route()
• stplanr::overline()

react to clicks on map with shiny

• clicks on leaflet maps can be accessed in shiny via an observeEvent(input$map_shape_click, {})

Air traffic between German Airports

Origin destination with flowmap.blue

• Flowmap.blue
• fast and easy viz of origin destination data
• can be done entirely without coding (with Google Sheets)
• new: R package

get OSM data with a single line of code via osmdata

• OpenStreetMap overs a huge ressource on openly available geodata (streets, rivers, restaurants, stores, … )
• this data can be retrieved with the Overpass API which is accesible with the osmdata package in R

opq(bbox = 'berlin germany') %>%
     add_osm_feature(key = 'amenity', value = c('fast_food', 'restaurant')) %>% 
     osmdata_sf ()

• auto aggregated grids with mapdeck
  • mapdeck::add_screengrid()

All traffic accidents in Stuttgart

elevation and hexagons with mapdeck

all U-Bahns in Berlin

moving lines with mapdeck

• mapdeck::add_trips()